docs: def remove_citation_metadata(graph):
      """Remove the metadata associated with a citation.
  
      Best practice is to add this information programmatically.
      """
      for u, v, k in graph.edges(keys=True):
          if CITATION not in graph[u][v][k]:
              continue
          for key in list(graph[u][v][k][CITATION]):
              if key not in _CITATION_KEEP_KEYS:
                  del graph[u][v][k][CITATION][key]